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Subject[PATCH 0/2] IIO version of INA2xx (followup of related RFC)
Date
following RFC started in https://lkml.org/lkml/2015/11/10/370
and feed back from https://lkml.org/lkml/2015/11/18/395

* squash to a single patch that provides DIRECT and SOFTWARE buffer mode.

* implement INFO_INT_TIME abi for each adc in order to better match how
the chip works. This also allows to compute the actual sample freq
for INFO_SAMP_FREQ, that results from both the averaging ratio and the
possible integration times.

* Add an INT_TIME setting for each voltage ADC (default values are compa
-tible for previous implementations).

* provide the averaging feature of the chip using the OVERSAMPLING_RATIO
abi.

* by default, only issue a new sample value in the buffer when the
Conversion Ready Flag indicates that a new value is available. The
capture thread polls slightly faster than the chip-internal sampling
clock to prevent re-read or skipping of samples.

* Since this check for CVRF has its cost (i2c xfer), allow for a relaxed
mode for when re-read or skipping or one sample is not big deal, but
a faster sampling rate is wanted.

* remove the calibration INFO, since the driver sets a hardcoded value
for 'Current_LSB', only RShunt is available as a parameter. No use to
expose the register to the user.

Why two drivers (hwmon and IIO) for this device ?
------------------------------------------------

* Hwmon and IIO do not address exactly the same use-cases, while this chip
can (and is) being used either as a power monitoring feature of a host
device or as sensor to measure power properties of a target DUT.

* In the second use-case (probing a DUT) we wish to plot measurements
over time, display transients, peak values, compute derived metrics
(like energy). A buffer streaming scheme and remote capabilities
with libiio seems beneficial.


Marc Titinger (1):
iio: ina2xx: add support for TI INA2xx Power Monitors
iio: ina2xx: provide a sysfs parameter to allow async readout of the
ADCs

drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ina2xx-iio.c | 720 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 731 insertions(+)
create mode 100644 drivers/iio/adc/ina2xx-iio.c

--
1.9.1



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